EP0609147B1 - Vorrichtung und Verfahren zur akustischen Messung der physikalischen Eigenschaften einer Flüssigkeit - Google Patents

Vorrichtung und Verfahren zur akustischen Messung der physikalischen Eigenschaften einer Flüssigkeit Download PDF

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Publication number
EP0609147B1
EP0609147B1 EP19940400171 EP94400171A EP0609147B1 EP 0609147 B1 EP0609147 B1 EP 0609147B1 EP 19940400171 EP19940400171 EP 19940400171 EP 94400171 A EP94400171 A EP 94400171A EP 0609147 B1 EP0609147 B1 EP 0609147B1
Authority
EP
European Patent Office
Prior art keywords
wave
transducer
cavity
coefficient
transducers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19940400171
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English (en)
French (fr)
Other versions
EP0609147A1 (de
Inventor
Jean-Yves François Roger Chatellier
Jean-Louis Fachinetti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Safran Aircraft Engines SAS
Original Assignee
Societe Nationale dEtude et de Construction de Moteurs dAviation SNECMA
SNECMA SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Societe Nationale dEtude et de Construction de Moteurs dAviation SNECMA, SNECMA SAS filed Critical Societe Nationale dEtude et de Construction de Moteurs dAviation SNECMA
Publication of EP0609147A1 publication Critical patent/EP0609147A1/de
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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/02—Analysing fluids
    • G01N29/032—Analysing fluids by measuring attenuation of acoustic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/028—Material parameters
    • G01N2291/02818—Density, viscosity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/028—Material parameters
    • G01N2291/02827—Elastic parameters, strength or force

Definitions

  • An apparatus and a method of measuring physical characteristics of a acoustically liquid i.e. a signal ultrasonic or possibly audible is used to measure for example the density, the attenuation sound propagation speed or elastic modulus of the liquid.
  • Density is given by a formula which involves the intensities of first three reflections towards the starting face of the wave (for which, respectively, the wave does not cross the cavity and cross two and four times) as well as the times elapsed until the first two reflections come back on the face resignation.
  • the invention relates to an apparatus such as defined in claim 1, and a process as defined in claim 4, sophisticated and more complicated including the essential advantage is to allow to measure other characteristics of the liquid, and with good precision.
  • the measuring device is characterized by a pair of acoustic transducers mounted in opposition and an assembly composed of a layer of a first solid material in front of one of the transducers, of a layer of a second solid material in front of the other transducer and a cavity filled with the measured liquid between the two layers.
  • At least one of the transducers is suitable for the emission of sound or ultrasonic waves, and both are capable of receiving these waves.
  • One of the layers be formed by a pellet housed in a housing delimiting the cavity and the other layer of which forms part and in that the transducers are embedded in the case.
  • the method consists in emitting a wave acoustic by one of the transducers, to collect and measure by said transducer the wave reflections reflected on the interfaces between the cavity and each of the two layers and by the other transducer the wave direct and the reflected wave once on each of the interfaces.
  • the device of Figure 1 comprises a housing 1 composed of a cylindrical wall 2 and hollowed out in sound center and a cover 3 assembled by screws such that 4 at a longitudinal end of the wall; a emission transducer 5 (also suitable for reception) is inserted in the central recess of the wall 2 over part of its length and a receiving transducer 6 is housed opposite to the previous one, in the axis of the recess, and pressed in a blind recess of the cover 3 so as to touch its bottom wall.
  • a housing 1 composed of a cylindrical wall 2 and hollowed out in sound center and a cover 3 assembled by screws such that 4 at a longitudinal end of the wall; a emission transducer 5 (also suitable for reception) is inserted in the central recess of the wall 2 over part of its length and a receiving transducer 6 is housed opposite to the previous one, in the axis of the recess, and pressed in a blind recess of the cover 3 so as to touch its bottom wall.
  • a magnesium tablet 8 is located in the recess in wall 2 and in front of the transducer 5, by touching it. Part of the recess is not occupied, however, and forms a cavity 9 cylindrical between the pad 8 and the cover 3.
  • a hole 10 which crosses obliquely the wall 2 allows access cavity 9 and fill it with liquid measure.
  • the device is assembled by placing the pad 8 at a position which is measured with precision, and which can possibly be defined by stops in the recess, after which a screw pressure 11 engaged radially through the wall 2 blocks the pad 8 at the chosen position.
  • the next stages of assembly consist of place transducers 5 and 6 in their recesses and to fix the cover 3 on the wall 2.
  • Figure 2 illustrates an embodiment similar in principle but where the cavity 9, which was entirely surrounded by wall 2 except of the outlet represented by the hole 10 in the previous embodiment, is replaced by a 9 'cavity open at its ends and which is surrounded on three sides by a wall 2 ', which forms a quadrilateral with the cover 3 'plane which is linked to it.
  • a handle 14 is screwed to the 3 'cover and the device is therefore a probe which can be immersed in the liquid to be measured.
  • the rest of previous description applies as is to this realization, and the measurement mode remains the even.
  • the emission transducer 5 is used for emit an ultrasonic wave with a frequency of 5 about megahertz whose energy is then shared in several waves according to partial reflections undergone at interfaces 12 and 13.
  • A0 the wave reflected towards the emission transducer 5 to the interface 12 between the cavity 9 and the patch 8
  • A1 the reflected wave towards the emission transducer 5 to the interface 13 between the cavity 9 and the cover 3
  • A2 the direct wave, which reaches the transducer reception 6 without having been reflected
  • the intensities of waves A0 to A3 are given by formulas (1) to (4).
  • AT 0 t'r 34 you -2 ⁇ 3 x 3
  • AT 1 t't 34 r 45 t 43 you (-2 ⁇ 3 x 3 ) e (-2 ⁇ x)
  • AT 2 t't 34 t 45 t t e (- ⁇ 3 x 3 ) e (- ⁇ x) e (- ⁇ 5 x 5 )
  • AT 3 t't 34 r 45 r 43 t 45 t t e (- ⁇ 3 x 3 ) e (-3 ⁇ x) e (- ⁇ 5 x 5 )
  • m is close to 1 for get better accuracy.
  • the invention can easily and advantageously find employment for measurements on resins in polymerization course at different temperatures, on solvents and generally on liquids of any kind and possibly expensive liquids, whose apparatus of the first realization makes it possible not use only a very small amount.

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  • Physics & Mathematics (AREA)
  • Biochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Acoustics & Sound (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)

Claims (4)

  1. Meßvorrichtung zur Messung von Eigenschaften einer Flüssigkeit
    mit einem Paar von akustischen Wandlern (5, 6), die einander gegenüberliegend montiert sind, wobei wenigstens einer dieser Wandler ein Sender-Empfänger ist,
    sowie mit einer Anordnung, bestehend aus einer Schicht (8) aus einem ersten festen Material vor einem der Wandler (5), einer Schicht (3) aus einem zweiten festen Material vor dem anderen Wandler (6) und einem mit der Meßflüssigkeit gefüllten Hohlraum (9) zwischen den beiden Schichten,
       dadurch gekennzeichnet,
       daß eine der Schichten von einem Plättchen (8) gebildet wird, das in einem den Hohlraum (9) begrenzenden Gehäuse (1) angeordnet ist, von dem die andere Schicht ein Bestandteil ist.
  2. Meßvorrichtung nach Anspruch 1,
       dadurch gekennzeichnet,
       daß die Wandler (5, 6) in das Gehäuse (1) eingelassen sind.
  3. Meßvorrichtung nach Anspruch einem der Ansprüche 1 oder 2,
       dadurch gekennzeichnet,
       daß die Schicht, die mit dem als Sender-Empfänger ausgebildeten Wandler in Kontakt steht, aus einem leichten Material, z. B aus Magnesium, besteht.
  4. Verfahren zur Messung von Eigenschaften eines Materials mittels einer Vorrichtung nach einem der vorhergehenden Ansprüche mit den Verfahrensschritten:
    Aussenden einer akustischen Welle durch einen der Wandler (5), der als Sender-Empfänger ausgebildet ist,
    Empfangen und Messen der an der Grenzfläche (12) zwischen dem Hohlraum (9) und der Schicht (8) reflektierten Welle (A0) mittels des genannten Wandlers (5) und der direkten Welle (A2) mittels des anderen Wandlers (6),
       gekennzeichnet durch folgende weiteren Verfahrensschritte:
    Empfangen und Messen der an der Grenzfläche (13) reflektierten Welle (A1) mittels des genannten Wandlers (5) und
    Empfangen und Messen der an jeder der Grenzflächen (12, 13) einmal reflektierten Welle (A3) mittels des anderen Wandlers (6).
EP19940400171 1993-01-27 1994-01-27 Vorrichtung und Verfahren zur akustischen Messung der physikalischen Eigenschaften einer Flüssigkeit Expired - Lifetime EP0609147B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9300769 1993-01-27
FR9300769A FR2700854B1 (fr) 1993-01-27 1993-01-27 Appareil et procédé de mesure de caractéristiques physiques d'un liquide par voie acoustique.

Publications (2)

Publication Number Publication Date
EP0609147A1 EP0609147A1 (de) 1994-08-03
EP0609147B1 true EP0609147B1 (de) 1998-03-11

Family

ID=9443379

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940400171 Expired - Lifetime EP0609147B1 (de) 1993-01-27 1994-01-27 Vorrichtung und Verfahren zur akustischen Messung der physikalischen Eigenschaften einer Flüssigkeit

Country Status (3)

Country Link
EP (1) EP0609147B1 (de)
DE (1) DE69408878T2 (de)
FR (1) FR2700854B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022263854A1 (en) * 2021-06-17 2022-12-22 Tribosonics Limited Fluid sensor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2856795B1 (fr) * 2003-06-25 2005-08-26 Inst Francais Du Petrole Methode de mesure des parametres elastiques d'un materiau poreux

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3359788A (en) * 1965-03-02 1967-12-26 Donald W Colvin Ultrasonic measurement of solution concentration
US4991124A (en) * 1988-10-11 1991-02-05 Simmonds Precision Products, Inc. System and method for ultrasonic determination of density
US5064412A (en) * 1989-09-05 1991-11-12 Pacesetter Infusion, Ltd. Ultrasonic air-in-line detector for a medication infusion system
DE59105923D1 (de) * 1990-09-28 1995-08-10 Siemens Ag Ultraschall (US)-Dichtemesser zum Messen der spezifischen Dichte eines Fluid.
DE59208489D1 (de) * 1991-09-30 1997-06-19 Siemens Ag Verfahren und Vorrichtung zur im wesentlichen dämpfungsunabhängigen Messung der Dichte von Flüssigkeiten mittels Ultraschall

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022263854A1 (en) * 2021-06-17 2022-12-22 Tribosonics Limited Fluid sensor

Also Published As

Publication number Publication date
DE69408878D1 (de) 1998-04-16
FR2700854B1 (fr) 1995-03-03
FR2700854A1 (fr) 1994-07-29
DE69408878T2 (de) 1998-08-06
EP0609147A1 (de) 1994-08-03

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